print((function ()
        local a = string.byte("a")
        local d = a - string.byte("A")
        return function (s)
                local r = s:gsub(".", function (e)
                        e = string.byte(e)
                        return e >= a and string.char(e-d) or string.char(e+d)
                end)
                return r
        end
end)()(io.stdin:read("*l")))